Quodlibeta

What is the best way to add footnotes to an essay on the web? Make a footnote a link like this (1) but you slip get back. Perhaps javascript can help. I am playing with using alerts which can be activated by clicking on a [NOTE] and made to go away again just as fast. I wonder if this works on Netscape as apparantly the javascript on the Great Library essay does not. I am using the alert method on an essay on Witch trials and then will try and put the big Alexandria essay on line as well.